Would any of you happen to know the compression ratio of a standard deck heighth '83 280zx block with standard size flat top pistons, and an E31 head strapped on it, no metal removed from the underside of this either.

 

L28 block
L28 rods (130.3mm)
E31 head (42.4cc)
Std gasket (7.6cc)
L28 crank (79.0mm)
L28 flattops (86.0mm)
=10.2:1

Ben
Adelaide,
South Australia.